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PMCID: PMC197701  PMID: 16017618
6.  President's Page 
PMCID: PMC199098  PMID: 16017466
7.  MEDLARS Operating Experience: Addendum * 
This brief note supplements the article which appeared in the BULLETIN in the January 1966 issue (vol. 54, p. 1-10). Data for six additional months of operation are given, representing 192 additional searches. Original personnel costs are confirmed; machine costs are considerably lower than during the earlier period. It is estimated that, under the conditions indicated, the cost of a search per year searched is about $66.00.
PMCID: PMC198452  PMID: 5921471
PMCID: PMC198068  PMID: 16017313
10.  The Development of MEDLARS 
The MEDLARS (Medical Literature Analysis and Retrieval System) Project grew out of the National Library of Medicine Index Mechanization Project of 1958-60, previously reported. Work on MEDLARS has been in progress for over two years, and the system should be operational at the beginning of 1964. MEDLARS is a computerized information retrieval system with three major types of products: (1) one-shot demand searches on questions of great complexity, (2) recurring bibliographies in special fields of the medical sciences, and (3) composition of a comprehensive periodical index, the Index Medicus.
PMCID: PMC198085  PMID: 14119285
PMCID: PMC197981  PMID: 16017290
12.  Communications to the Editor 
PMCID: PMC197951  PMID: 13982385
13.  President's Page 
PMCID: PMC197910  PMID: 16017272
PMCID: PMC200617  PMID: 16017187
PMCID: PMC200471  PMID: 16017136
24.  Problems of Medical Subject Cataloging * 
The subject catalog of the University of Colorado Medical Center Library is examined in considerable detail. Annual revisions of the subject catalog required by annual revisions of the subject heading authority list used, NLM's MeSH, are analyzed in terms of man-hours required for the effort and the effect on the catalog's structure. It is contended that, in a divided catalog, changes of headings on a one-for-one equivalency basis are no more difficult than they would be in a computerized catalog, but that in many-for-one changes the manual catalog and the machine catalog face exactly the same dilemma and in the same magnitude, the only solution in either case being the reexamination of many entries. The proliferation of subheadings is shown to present particularly vexing problems in catalog revision. A plea is made to recognize the MeSH system for what it is, a legitimate compromise between the descriptor-oriented terms of a computer coordinate-indexing system, and the subject-heading-oriented terms of the conventional card catalog.
PMCID: PMC200733  PMID: 5702316
25.  MEDLARS Operating Experience at the University of Colorado * 
For a six-month period in 1965 the University of Colorado Medical Center Library conducted a demonstration project in which MEDLARS tapes received from the National Library of Medicine were searched on a Honeywell 800 computer located in Denver. Eighty-seven search requests were received from members of the UCMC staff during this period and successfully run. The average relevance and recall ratios were each in the neighborhood of 80 percent. Cost figures are given; it is calculated that an average search through two years' tapes costs about $200. The concept of the “search-month” is introduced, and it is shown that the average machine time per search-month will vary from 0.67 to 2 minutes. It is concluded that the technical and economic feasibility of decentralized search centers using a centrally prepared input has been demonstrated. Data are presented on the basis of which the performance of the system may be judged.
PMCID: PMC198362  PMID: 5901357

Results 1-25 (26)